A sound hole is an opening in the upper sound board of a stringed musical instrument. The sound holes can have different shapes: round in flat-top guitars; F-holes in instruments from the violin, mandolin or viol families and in arched-top guitars; and rosettes in lutes. Bowed Lyras have D-holes and mandolins may have F-holes, round or oval holes. A round or oval hole is usually a single one, under the strings. F-holes and D-holes are usually made in pairs placed symmetrically on both sides of the strings. Some electric guitars, such as Fender Telecaster Thinline and the majority of Gretsch guitars have one or two sound holes.
Though the purpose of sound holes is to help acoustic instruments project their sound more efficiently, the sound does not emanate solely (nor even mostly) from the location of the sound hole. The majority of sound emanates from the surface area of both sounding boards, with sound holes playing a part by allowing the sounding boards to vibrate more freely, and by allowing some of the vibrations which have been set in motion inside the instrument to travel outside the instrument.
Alternative sound hole designs 
Some Ovation stringed instruments feature a unique soundhole architecture with multiple smaller soundholes that, being combined with a composite arch-top guitar body are said to produce a clear and bright sound.
Tacoma Guitars has developed a unique "paisley" soundhole placed on the left side of the upper bout of their "Wing Series" guitars. This is a relatively low-stress area that requires less bracing to support the hole.
Holes not positioned on the top of an acoustic guitar are called soundports.They are usually supplementary to a main soundhole, and located on an instrument's side facing upward in playing position, allowing players to monitor their own sound.
Single F-Hole on a Fender Telecaster Thinline
Leaf sound hole in an Ovation Adamas guitar
Many acoustic guitars incorporate rosettes around the sound hole.
Maccaferri guitars have D or Oval shaped holes.
- Stringworks U - brief explanation of the effects of sound holes, with a closeup diagram of an f-shaped soundhole
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